Changes needed to get stdbuf to successfully preload libstdbuf.so
for both 32-bit and 64-bit applications. See comment in the patch
for more details.
This change has been passed upstream, but the GNU coreutils maintainer
turned it into a comment explaining why it's not included by default.
--- coreutils-8.16/src/stdbuf.c.orig 2013-09-04 19:05:35.225857588 -0700
+++ coreutils-8.16/src/stdbuf.c 2013-09-04 19:11:51.945113130 -0700
@@ -195,37 +195,13 @@
gcc stdbuf.c -Wl,-rpath,'$ORIGIN' -Wl,-rpath,$PKGLIBEXECDIR
However we want the lookup done for the exec'd command not stdbuf.
- Since we don't link against libstdbuf.so add it to PKGLIBEXECDIR
- rather than to LIBDIR. */
- char const *const search_path[] = {
- program_path,
- PKGLIBEXECDIR,
- NULL
- };
+ Since we don't link against libstdbuf.so, we need to LD_PRELOAD it.
+ LD_PRELOAD=libstdbuf.so, and ld.so.1 finds the right one associated
+ with the process class. ie. we don't use full path names for the
+ preload names. */
- char const *const *path = search_path;
- char *libstdbuf;
-
- while (true)
- {
- struct stat sb;
-
- if (!**path) /* system default */
- {
- libstdbuf = xstrdup (LIB_NAME);
- break;
- }
- ret = asprintf (&libstdbuf, "%s/%s", *path, LIB_NAME);
- if (ret < 0)
- xalloc_die ();
- if (stat (libstdbuf, &sb) == 0) /* file_exists */
- break;
- free (libstdbuf);
-
- ++path;
- if ( ! *path)
- error (EXIT_CANCELED, 0, _("failed to find %s"), quote (LIB_NAME));
- }
+ char *libstdbuf = xstrdup (LIB_NAME);
/* FIXME: Do we need to support libstdbuf.dll, c:, '\' separators etc? */